Expression of substance P, neurokinin 1 receptors(NK1) and neurokinin 3 receptors in the developing mouse retina and in the retina of NK1 knockout mice

Elisabetta Catalani, Carlo Gangitano, M Dal Monte, M Lucattelli, S Fineschi, L Bosco, P Bagnoli, G. Casini

Risultato della ricerca: Contributo in rivistaArticolo in rivista

11 Citazioni (Scopus)

Abstract

Abstract—To complete a series of studies on the expression of substance P and neurokinin receptors in mammalian retinas, we investigated the occurrence of these molecules in developing mouse retinas and in retinas of mice with genetic deletion of the neurokinin 1 receptor, the preferred substance P receptor. Using semi-quantitative reverse transcription– polymerase chain reaction, we measured detectable levels of the isoform of preprotachykinin A (a substance P precursor) mRNA at postnatal day 4. Neurokinin 1 receptor and neurokinin 3 receptor mRNAs were also detected at postnatal day 4. While preprotachykinin A and neurokinin 1 receptor mRNA levels significantly increased up to eye opening (postnatal day 11), neurokinin 3 receptor mRNA levels remained constant throughout development. Substance P, neurokinin 1 receptor and neurokinin 3 receptor immunoreactivities were present at postnatal day 5. Substance P was in amacrine cells, neurokinin 1 receptor in developing amacrine and bipolar cells and neurokinin 3 receptor in OFF-type cone bipolar cells. Interestingly, a transient increase in the density of neurokinin 1 receptor immunoreactive processes was observed at eye opening in lamina 3 of the inner plexiform layer, suggesting a role of substance P and neurokinin 1 receptor in this developmental phase. However, in neurokinin 1 receptor knockout retinas, besides a significant increase of the preprotachykinin A mRNA levels, no major changes were detected: neurokinin 3 receptor mRNA levels as well as substance P and neurokinin 3 receptor immunostainings were similar to wild types. Together with previous studies, these observations indicate that there are major differences in neurokinin 1 receptor expression patterns among developing mammalian retinas. The observations in neurokinin 1 receptor knockout mice may not be applicable to rats or rabbits, and substance P and neurokinin 1 receptor may play different developmental roles in different species.
Lingua originaleEnglish
pagine (da-a)487-499
Numero di pagine13
RivistaNeuroscience
Volume138
Stato di pubblicazionePubblicato - 2006

Keywords

  • amcrine cells
  • bipolar cells
  • inner plexiform layer
  • neuropeptide receptors
  • vesicular acetylcholine transporter

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